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O: Fachverband Oberflächenphysik

O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures

O 37.35: Poster

Dienstag, 1. April 2014, 18:30–22:00, P2

Time-domain characterization of scattered fields from nanotextured thin film absorbers — •Dominik Differt, Stanislaw Nickel, and Walter Pfeiffer — Fakultät für Physik, Universität Bielefeld, 33615 Bielefeld, Germany

Recent investigations revealed that light trapping in localized photonic modes enhances absorption in thin film silicon solar cells with nanotextured interfaces. These localized modes can be detected and characterized by spectral interferometry of backscattered radiation if a sufficiently small illumination spot is chosen. Here we use dual channel spectral interferometry to fully characterize the temporal evolution of the backscattered light from fs laser materials processed amorphous silicon layers and nanotextured thin film silicon solar cells illuminated by ultra short laser pulses. Performing a 2D point to point surface scan of the backscattered light over the sample with a high resolution reveals localized photonic modes in both samples. Finally, the prospect to coherently control absorption in these modes by use time-reversed or adaptively optimized light pulses generated using a vector field pulse shaper is discussed.